Sickle bar for mowing machines



July 23, 1935. J. J. DAVIS SICKLE BAR FOR MOWING MACHINES Filed Sept.29, 1933 2 Sheets-Sheet l Inventor f f (pay/11' Attorney July 23, 1935.DAVIS 2,009,339

SICKLE BAR FOR MOWING MACHINES Filed Sept. 29, 1935 2 Sheets-Sheet 2 7/I nvenflor cJTc/T Jay/1:

29- I QMM O'A Patented July 23, 1935 UNITED STATES I PATENT OFFIGE2,009,339 sioKLE BAR FonMowiNc moraines Joseph JamcsDavis, Bethel, vApplication September 29, 1933, Serial No. 691,547 I lClaim. (01.56 300)This invention relates to an improved reciprocatory cutter or sicklebarsuch as is used in present day mowing and equivalent reaping andcutting machines.

Stated more explicitly the invented conception comprehends the provisionof a scientifically correct properly balanced multiple tooth assemblagewherein the abutting teeth are detachably mount- 1 ed on the supportingbar by efficient .quick .de-

tachable means of a type and style calculated to permit selectiveremoval, replacement and sharpening of damaged teeth.

Needless to say I am aware of the fact that l itgis not broadly new inthis particular line ofv endeavor to detachably connect the cutterplates or teeth with the backing and supporting bar in amanner toexpedite renewal and sharpening. Therefore, it is my principal aim togenerally improve upon known patented and marketed-ai rangement throughthe-adoption and use of a more systematic assemblage whose features-ofaccommodation and adaptation transcend those of similar arrangements.

In carrying the principles of the present inventive idea into actualpractice measures are taken to provide a more satisfactory; simplifiedand dependable construction devoid of superfluous details andcharacterized by requisite E, strength and" durability in order tobetter iulfi'll the requirement of a construction of this class.

By way of introduction it is to be pointed out that in the aforesaidprior art devices acknowledged to be old it is generally necessary toresort to revision and changes in the fundamental details of theconventional style cutterbar. By way of contrast the improvementconstituting the novelty of this invention provides an arrangement Whoseparts are aptly fitted to serve on the marketed type apertured cutterbar without requiring alterations in the stock parts, this being alogical and impressive refinement destined to be recognized as one ofthe principal improvements of the invention.

Other features and advantages will become more readily apparent from thefollowing description and drawings.

In the drawings:-

Figure l is an elevational view of a structure developed in accordancewith the principles and fundamentals of the present invention,

Figures 2, 3 and 4 are transverse sectional views taken on the planes ofthe lines 2-2, 3-3 and.

4-4, respectively of Figure 1.

Figure 5 is an elevational View of one species or variety of tooth orplate used in the improved assemblage. I A 5 Figures 6 and 7 areelevational views of other complemental and companion types of plates.Figures- 8 and-9 are detail elevational views of the especiallyfashioned retaining rivet used in perfecting the invention. K

Referring now to Figure l, I call attention to that part designated asaconventiona-l castingor unit' which comprises the usuai'type plate-likecasting it having a ball joint-connector H for-med integral therewith toaccommodate thepitmah (not shown) or other actuating means commonly usedin this type of machine. This: casting also includes an extension 12disposed in spaced parallelism with the adjacent end portion of the mainsupporting bar 1-3 for the various cutterplates or teeth. At the lefthand end this bar 13 is riveted or otherwise secured to the main casting10. As shown in Figure 8 specialcon necting pins or rivets are providedhere, the rivets being formed with a flattenedhemispherical-head M onthe side adjacent the-bar i3 and a frustroconical head 15 on the castingside. The shank portion is enlarged as indicated at 46 to form ashoulder which bears against the bar I3 and which portion also serves asan anchor for the coordinated or complemental cutter plate. Incidentallythe term plate and the term-teeth" are used in an equivalent sense toindicate-the plate-like cutting elements. As-a matter of distinctionbetween the three different sets of plates I desire to differentiatethem as follows. There are two companion plates I! at the left in Figure1 located between the parts I0 and I3. At the extreme right hand endthere is what may be designated as a master or key plate 18 and the onesbetween these plates I! and i8 constitute the regular or standardizedones which are differentiated by the numerals l9. All of the plates 19are of the same construction and the description of one will suffice forall. Considering first the plate I"! shown in Figure 5 it will be seenthat it is of customary configuration so far as shape is concerned butprovided in one side edge portion with a keeper notch 20 and in the rearedge portion with an L-shaped slot which may be described as a bayonetslot, the same including an entrance portion 2i and a seating branch 22for cooperation with the portion l6 of the rivet. The terminal or endplate l8 shown in Figure '7 is the same in general outline but providedin one sideedge with a keeper and guide notch 23 and in the oppositeedge portion with a bolt hole 24. This is adapted to accommodate a boltor permanent rivet 25 as shown in Figure 1 which must be removed topermit this plate [8 to be taken off and to allow the remaining platesl9 and H to be selectively removed or replaced as conditions require.

All of the plates I9 are'the same in construction as shown in Figure 6,each plate is formed in the left hand side edge portion with a notch 26opposite to which is a key-hole slot 21 and a clearance and assemblingniche 28. It is to be pointed out that the rivet used to hold the plateI9 in place is somewhat similar to the one used to hold the plate il inposition. One of these rivets is shown in Figure 9 and comprises acylindrical shank 29 having a frustro-conical head 30 and an enlargedshoulder forming portion 3|. The shoulder 3i bears against the attachingbar l3 as shown in Figure 4. and the shank 29 has its terminal portionshaped into a retaining head 32. The conical head 38 serves to hold theplate in position, said plate being supported on the shoulder part 3!between said head 30 and bar [3.

It is to be pointed out that the bar l3 as generally marketed is simplya longitudinally elongated member permanently riveted at the left handend to the mounting or casting Ill. At predetermined longitudinallyspaced points it is provided with apertures to accommodate double headedrivets (not shown) which are used to hold similar cutting bladesthereon. These plates are permanently held by the rivets and wheneverone plate wears out and must be replaced it is necessary to file off therivet and replace the plate with new rivets, etc. This is time consumingand inconvenient. For the present arrangement the plates 19 are easilyheld in place by the conical headed rivets of the style shown in Figure9 in themanner illustrated in Figure 4. These rivets are allowed toremain permanently in place. By using the style of rivets which is shownin Figure 9, plates l9 can shank or rivet then sliding the plate fromright to left. The clearance niches -28 facilitate this placement of theplates I9. In order to change one of the plates I9 it is necessary toremove the master or key cutter plate l8 by taking out the bolt or rivet25 as the case may be. The manner of inserting and removing the platesI1 is slightly different but is perfectly clear, it being simplynecessary to angle the plate with respect to the supporting rivets sothat they can be inserted between the two parts I0 and I3 and easilyslipped into place.

Novelty is thought to reside in the provision of a mounting bar havingthe headed permanently attached shouldered rivets to accommodate theslotted plates [1, I8 and 19, particularly in conjunction with thesingle key forming plate l8 which is permanently held in its keyposition by a bolt or equivalent permanent fastener 25. When once thisis removed the remaining plates can be easily removed and replaced as isobvious. I

A careful consideration of the foregoing description in conjunction withthe illustrative drawings Will enable the reader to obtain a clearunderstanding of the purpose, features and advantages, the explicitconstruction, and the invention as hereinafter claimed.

It is to be understood that minor changes in shape, size, relativeproportions, and materials may be resorted to in practice withoutdepart-- ing from the spirit of the invention or the scope of theinvention as now claimed.

What is claimed is:

In a sickle bar for mowing machines in which is comprised areciprocatory bar, cutting plates arranged edgewise in series and.superimposed flatwise on the bar, and means detachable from the outerend portion of the bar for normally holding said plates against edgewisemovement, the combination with said reciprocatory bar and cuttingplates, of rivets having shanks permanently secured in said bar atintervals in the length of the bar and also having enlarged shankportions bearing at their lower ends against the upper side of the bar,said enlarged shank portions disposed in the cutting plates and saidplates disengageable from the rivets on edgewise movement of the platesafter said first-named means is detached, and said rivets further havingenlarged heads above said enlarged shank portions and arrangedimmediately above said cutting plates.

JOSEPH JAMES DAVIS.

